from flask import render_template, current_app, session, g, abort, jsonify, request
from sqlalchemy.sql.functions import user

from info import constants, db
from info.models import News, Comment, CommentLike, User
from info.modules.news import news_blu
from info.utils.common import user_login_data
from info.utils.response_code import RET


@news_blu.route('/followed_user',methods=['POST'])
@user_login_data
def followed_user():
    """关注与取消关注"""
    user=g.user
    user_id=request.json.get('user_id')
    action=request.json.get('action')
    if not all([user_id,action]):
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')
    if action not in ('follow', 'unfollow'):
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')
     # 查询关注数据
    try:
        user_id=int(user_id)
        users=User.query.get(user_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')
    if not users:
        return jsonify(errno=RET.DBERR, errmsg='数据库查询失败')
    if action=='follow':
        if users not in user.followed:
            user.followed.append(users)
        else:
            return jsonify(errno=RET.DATAEXIST, errmsg='当前已被关注')
    else:
        if users in user.followed:
            user.followed.remove(users)
        else:
            return jsonify(errno=RET.DATAEXIST, errmsg='当前未被关注')

    return jsonify(errno=RET.OK, errmsg='操作成功')


@news_blu.route('/comment_like', methods=['post'])
@user_login_data
def comment_like():
    """点赞与取消点赞后端逻辑实现"""
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg='用户未登录')
    comment_id = request.json.get('comment_id')
    news_id = request.json.get('news_id')
    action = request.json.get('action')

    if not all([comment_id, news_id, action]):
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')
    if action not in ('add', 'remove'):
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')

    # 查询评论数据
    try:
        comment = Comment.query.get(comment_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg='查询数据失败')
    if not comment:
        return jsonify(errno=RET.NODATA, errmsg='评论数据不存在')
    # 点赞和取消点赞逻辑实现

    if action == 'add':
        # 增加点赞数据
        comment_like_model = CommentLike.query.filter(CommentLike.comment_id == comment_id,
                                                      CommentLike.user_id == user.id).first()
        if not comment_like_model:
            comment_like_model = CommentLike()
            comment_like_model.user_id = user.id
            comment_like_model.comment_id = comment_id
            db.session.add(comment_like_model)
            # 增加点赞条数
            comment.like_count += 1
    else:
        # 删除点赞数据
        comment_like_model = CommentLike.query.filter(CommentLike.comment_id == comment_id,
                                                      CommentLike.user_id == user.id).first()
        if comment_like_model:
            db.session.delete(comment_like_model)
            # 减小点赞条数
            comment.like_count -= 1
    try:
        db.session.commit()
    except Exception as e:
        current_app.logger.error(e)
        db.session.rollback()
        return jsonify(errno=RET.DBERR, errmsg='操作失败')

    return jsonify(errno=RET.OK, errmsg='操作成功')


@news_blu.route('/news_comment', methods=['post'])
@user_login_data
def news_comment():
    """评论后端实现"""
    # 获取参数
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg='用户未登录')
    data_dict = request.json
    news_id = data_dict.get('news_id')
    comment_str = data_dict.get('comment')
    parent_id = request.json.get("parent_id")
    # parents = data_dict.get("parent_id")
    # 校验参数
    if not all([news_id, comment_str]):
        return jsonify(errno=RET.PARAMERR, errmsg='参数不足')
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg='数据查询错误')
    if not news:
        return jsonify(errno=RET.NODATA, errmsg='新闻数据不存在')

    # 处理参数
    # 初始化模型，保存数据
    comment = Comment()
    comment.user_id = user.id
    comment.news_id = news.id
    comment.content = comment_str
    if parent_id:
        comment.parent_id = parent_id

    # 保存到数据库
    try:
        db.session.add(comment)
        db.session.commit()
    except Exception as e:
        current_app.logger.error(e)
        db.session.rollback()
        return jsonify(errno=RET.DBERR, errmsg='数据保存错误')
    # 返回结果
    return jsonify(errno=RET.OK, errmsg='评论成功', data=comment.to_dict())


@news_blu.route('/news_collect', methods=['post'])
@user_login_data
def news_collect():
    """收藏功能后端逻辑实现"""
    # 判断用户是否登录
    # 1.请求参数
    # 2.校验参数
    # 查询数据
    # 3.收藏或取消收藏，逻辑实现
    user = g.user
    json_data = request.json
    news_id = json_data.get('news_id')
    action = json_data.get('action')

    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg='用户未登录')
    if not news_id:
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')
    if action not in ('collect', 'cancel_collect'):
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')

    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg='数据查询错误')
    if not news:
        return jsonify(errno=RET.NODATA, errmsg='新闻数据不存在')

    if action == 'cancel_collect':
        if news in user.collection_news:
            user.collection_news.remove(news)
    else:
        if news not in user.collection_news:
            user.collection_news.append(news)

    return jsonify(errno=RET.OK, errmsg='操作成功')


@news_blu.route('/<int:news_id>')
@user_login_data
def news_detail(news_id):
    # # 获取当前登陆的用户id
    user = g.user
    # user_id = session.get('user_id')
    # # 通过id 获取用户信息
    # user = None
    # if user_id:
    #     try:
    #         user = User.query.get(user_id)
    #     except Exception as e:
    #         current_app.logger.error(e)
    # 获取点击排行数据
    news_list = None
    try:
        news_list = News.query.order_by(News.clicks.desc()).limit(constants.CLICK_RANK_MAX_NEWS)
    except Exception as e:
        current_app.logger.error(e)

    click_news_list = []
    for news in news_list if news_list else []:
        click_news_list.append(news.to_basic_dict())

    # 新闻详情页的数据展示
    news = None
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)

    if not news:
        abort(404)
    news.clicks += 1
    # 当前登录用户是否关注当前新闻作者
    is_followed = False
    # 用户收藏
    is_collected = False
    # if 用户是登录：
    #     if 用户收藏：
    #         is_collected=True
    if news.user_id:
        if news in user.collection_news:
            is_collected = True
        if news.user.followers.filter(User.id == user.id).count() > 0:
            is_followed = True

    # 用户评论查询
    comments = []
    try:
        comments = Comment.query.filter(Comment.news_id == news_id).order_by(Comment.create_time.desc()).all()
    except Exception as e:
        current_app.logger.error(e)

    # 需求：查询当前用户在当前新闻里面都点赞了那些评论
    comment_likes_ids = []
    if news.user_id:
        try:
            # 先把当前新闻的所有评论【comment]
            comment_ids = [comment.id for comment in comments]
            # 在查询当前评论那些评论被用户点赞[CommentLike] 查询comment_id在第一部的评论类表内的所有数据
            comment_likes = CommentLike.query.filter(CommentLike.comment_id.in_(comment_ids),
                                                     CommentLike.user_id == user.id).all()
            # 以上查出来的是一个[CommentLike]
            comment_likes_ids = [comment_like.comment_id for comment_like in comment_likes]
        except Exception as e:
            current_app.logger.error(e)
    comment_list = []
    for comment in comments:
        comment_dict = comment.to_dict()
        # 代表没有点赞
        comment_dict["is_like"] = False
        if comment.id in comment_likes_ids:
            comment_dict['is_like'] = True
        comment_list.append(comment_dict)

    data = {
        'user_info': user.to_dict() if user else None,
        'click_news_list': click_news_list,
        'news': news.to_dict(),
        'is_collected': is_collected,
        'comments': comment_list,
        'is_followed':is_followed
    }
    return render_template('/news/detail.html', data=data)
